Hey, so I wanted to post this in case anyone has run into the same issue I have. I recently got a 4K TV, and whenever I tried using my Hauppauge HD PVR 2 (Gaming Edition) with it I would get no audio output on my TV. I tried just about every setting in the Capture software, reinstalled everything, but had no luck. I would have audio just fine on my PC, but nothing would pass through to the TV.
Well by chance I disabled the HDR setting on my TV (the setting is called HDMI UHD color on my Samsung TV), and what do you know, now all of a sudden I have audio on my TV!
I hope this can help you if you’ve had a similar problem.
Best of luck!